Power steering device

Abstract

A power steering apparatus integrally comprises an electric motor, a hydraulic pump driven by the electric motor, and a controlling device which is disposed between the electric motor and hydraulic pump and which controls the electric motor, in which steering is assisted by oil pressure generated by the hydraulic pump, wherein a radiating body for radiating a heat generated by the controlling device is disposed between the controlling device and hydraulic pump, so that the heat generated by the controlling device is radiated to the hydraulic pump. With this configuration, it is possible to efficiently radiate a heat generated inside the controlling device, the heat radiation can be designed without being influenced by ambient condition, and it is possible to be replaced by, member having a low heat-resistance.

What is claimed is:  
     
       1. A power steering apparatus integrally comprising an electric motor, a hydraulic pump driven by said electric motor, and a controlling device which is disposed between said electric motor and hydraulic pump and which controls said electric motor, in which steering is assisted by oil pressure generated by said hydraulic pump, 
       wherein a radiating body for radiating a heat generated by said controlling device is disposed between said controlling device and hydraulic pump, so that the heat generated by said controlling device is radiated to said hydraulic pump.  
     
     
       2. The power steering apparatus according to claim  1 , wherein said radiating body is a sheet for transmitting the heat, held between said controlling device and hydraulic pump. 
     
     
       3. The power steering apparatus according to claim  1 , wherein said controlling device and hydraulic pump have fitting configurations, a cross section of said fitting configurations is approximately circular in shape, and a convex portion and concave portion of said fitting configurations provide a space for clamping an O-ring therebetween. 
     
     
       4. The power steering apparatus according to claim  1 , wherein said controlling device is contained inside a housing connected to said hydraulic pump, said housing and hydraulic pump have fitting configurations, a cross section of said fitting configurations is approximately circular in shape, and a convex portion and a concave portion of said fitting configurations provide a space for clamping an O-ring therebetween. 
     
     
       5. The power steering apparatus according to claim  2 , wherein said controlling device and hydraulic pump have fitting configurations, a cross section of said fitting configurations is approximately circular in shape, and a convex portion and concave portion of said fitting configurations provide a space for clamping an O-ring therebetween. 
     
     
       6. The power steering apparatus according to claim  2 , wherein said controlling device is contained inside a housing connected to said hydraulic pump, said housing and hydraulic pump have fitting configurations, a cross section of said fitting configurations is approximately circular in shape, and a convex portion and a concave portion of said fitting configurations provide a space for clamping an O-ring therebetween.